Like creating a post from scratch, replying to a post is different depending on which Hub Layout you select.
Video Layout
To reply to a post in this horizontal layout, go to the post you would like to reply to and Reply.

Each post can be replied to and replies can be viewed by selecting Replies on the right. You will see threaded replies that can be posted using text, video or voice.

Discussion Layout
To reply to a post using this vertical layout, go to Add a comment.

To view replies, select replies where you will be able to view the comments underneath the main post. You will then be asked how you would like to reply – Text, Record a video, or Voice.

Chat Layout
Like the Video Layout, replies are threaded. To reply or view a reply, select Reply and you will see the replies on the right. Replies can be text, video or voice replies.

